MONTREAL, QC - AUGUST 05: Jan-Lennard Struff of Germany hits a return ball against Jo-Wilfried Tsonga of France during day 4 of the Rogers Cup at IGA Stadium on August 5, 2019 in Montreal, Quebec, Canada. (Photo by Minas Panagiotakis/Getty Images)
MONTREAL, QC - AUGUST 05: Jan-Lennard Struff of Germany hits a return ball against Jo-Wilfried Tsonga of France during day 4 of the Rogers Cup at IGA Stadium on August 5, 2019 in Montreal, Quebec, Canada. (Photo by Minas Panagiotakis/Getty Images)